The Subversion Update action sychronises a working copy with the repository, by copying and merging files from the repository into it.
Work Folder: The current directory from which the command is run. See Subversion Actions.
Path: Optional. A space-separated list of paths to working copies to be updated.
Revision: Optional. The repository revision to update to. If not specified, the HEAD revision is used. See Subversion Actions for more information.
User Name/Password: User name and password if using authentication
Fail On Conflicts: Causes the action to fail if any merge conflict is found during the update. That is, if SVN reports "C" for the status of any item, the action will fail, but the full update will still have taken place.
General Options: See Subversion Actions for more information.